The goal of this clinical research study is to compare the effects of
Naproxen to a placebo on the normal colon of people with Lynch
syndrome. The safety of Naproxen is also being studied. Lynch Syndrome
is a disease associated with a higher risk of colon cancer and others
such as endometrium (lining of the uterus), ovarian, and other types of
cancers. A placebo is not a drug. It looks like the study drug but is
not designed to treat any disease or illness. It is designed to be
compared with a study drug to learn if the study drug has any real effect.